Wind Turbines and Wind Power | altE
This will offer a more accurate picture of what you can expect the wind turbine to produce in a month; and from there you can compare that production to the monthly usage (in kwh) on your electrical bill. For example the Primus Wind Power AIR 30 12 Volt DC Wind Turbine should produce about 20-25 kwh per month with average wind speeds of 10-12 mph.